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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75853034db817524617015b3a1697219acc8e92684db5dd7a8c088940725eed2' 
  AND token = 'K5YK8l30bIZ86NWenKHUu7YVr7Rsib7e+0oEvKgngC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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