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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '514561d4cc5b12e940b0916a2a64b8ffeef625dda641512bfcf31f6e9a86a7dc' 
  AND token = '9BrH4Z1Ig2RF9uVYQiRP5ABq9nyxMrzYAMziL62+3Rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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