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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcd77757233e672bdd2f8a28fcb301613811603b939b423c6265579c7f9aeaeb' 
  AND token = 'T62Vru8OUPM/j4caWY3e8J39wDMr7Jy24sBA1QWgldc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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