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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27d48cba919d0c42bd2e34a2f8515cf6d2ee3261d5635db8c36216054cb425db' 
  AND token = 'KowjNqoytHB6obPxdfkoJRL1QgUutiPZuFOl4fGQJW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}