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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e97d6a8eb1b45c8b9f9fa93bf9e1ae111ed260e981c88fd275049242ead59a62' 
  AND token = 'pMdFHSNkflIcrlxabvqnBtYtw4A6Eog+z2XTfrPpbuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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