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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8956cf4f6ce3917a3f0f49b79a8337da2a67278bfff1fd23695e2083e39b1c51' 
  AND token = 'dPkA3pZ6Ev/lbTyfEESWMX3SEiigWFFhE3EBAOzi8xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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