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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee9628b48093da24c5676ab28244cd248ed993603572d6f488d2d7e79216a2d6' 
  AND token = 'C/+L1s0Pl/jGi89nGmYu0RqXZF9rt13GsyKF2dkESKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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