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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0904f676d3224d2993c84bf2cb76b63b60e1bd54e46bc482a7e532b8cf3f90a5' 
  AND token = '5s5lHUf6Hr/zjdWCbDTzgQQB6G9jfMJhYEL3t5KOf4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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