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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f56b5b77bd2ecbcc7fdc2f973eb05aed75bfa8048062d1367a5aa67a44a58d7' 
  AND token = 'cKD93vLuelEbz6K5czcO28zy45/IV+qSEtgAcd3qyTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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