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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6f8f44dfcc83494463e679203791d56afdb2e02a298e9d474a628cc2665e76e' 
  AND token = 'nG4nmHeonWaQISiFvzcvsnDgDX6D7q8tLvYn6Xx8Qr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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