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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adcd592e75238cdec215e139b97e58f2774896ad48412859888f4f9c5bb7e04e' 
  AND token = 'CEzZEdjE9VVLIWRGj/s1xkJD7bohacA2hL409EX1n8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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