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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8fcd96b2d6c9b2d666c4533cda79558ba0e96a335239b051a3ca37edf6fd5d8' 
  AND token = '5BluZ1/Yk0WbiHSqup7C5T4hQasfkGWlrgw850kkE2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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