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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd713d591676f6349f009b330323289af3dfd26f9b84789955922b8a8dc2d0d39' 
  AND token = 'fPu4jfqo6ERIQQ8jwCMEBqqiNtb3fCTJiZj6CVuqH78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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