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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af4570e0c7e1b66de0336f22d6d1deb5ebd64be2b7ee1fd1923ca95736413868' 
  AND token = 'nx9m0ebc8k9D18HNpsDBLJLJTdzdjGm28KTwi7w+0pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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