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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9e36bc4ab2f56a115689db30fa7a04318834131baf7119987357457a5543c2b' 
  AND token = 'TDjoUFvuZOuVawGfvvd2yeyH7psH0CrlMIwN4e/j0nI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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