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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ca391a113a4178c0189c043aca6c7a307c5c81bc8f8417f9bbac8852f8f42f0' 
  AND token = 'QchlYFf5OySehmhY2xQbUEjmMyYfbTrwxwaGhz3Qopc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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