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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3052e66537d0ddc84896a53901fe6ece55193502213237975ff22f039b7c9e3' 
  AND token = '2tV0VQsZSlzIpe7775Q0qMmUgnthHbI9W1nar5uWS0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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