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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0392a3522610171cb45fc65c38a8837bacf4f04f948200e897feb235d1f4ef5' 
  AND token = 'h4h6iuZ74AXlzWBxXIheYNBKkEI2jMWqlhZtfY647X0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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