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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4ec405fe624367339820f3c0d3c3de82acc24df4ce92fa0902e4cf6e347ee45' 
  AND token = 'cl96yGjXk4gsMumPqTqMRVtnmxiKcweSDCS+Vpct5EE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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