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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa56d37c639ec0677e979d2c9d9b73db0aa2b0bb927f4130c52ef1188d17b6fc' 
  AND token = 'nGpDW0vndHFv9EyqQstdy0gzTgovAv7pGmhveAMBEOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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