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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e83929e27fb52325d122835d572ded10e3816953bc6e5753b21f9f53a784d3e' 
  AND token = 's3vSA4fUzqvOiIRrmQFESpQlUjVomw+I3+T1ZcGVNXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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