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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e26d92e46da39f3f3bb6aa6ae69e1bedaf9e4600f66dbf367877249b337420ae' 
  AND token = 'y3e3stY29Q7Lju4IOIlm3j9eIYJZ8ZqCE/mU+aridFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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