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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc70a53babd0c8bd24eacf106c98e29c49d7c74dc45ed4e4743817b3aa04508b' 
  AND token = 'Z/rQ/2peIbC3wRwMqeHBMPt5bT9pw0yw2vsVmuzd0U4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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