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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5b7b14402e33e037b2f2315b7e1fd1be152255771ff4b9a6748aaa28e20c305' 
  AND token = 'GgLuk59zBFBMWQWrXDR6RmlOyhB3dkbJqS3odIE1HnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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