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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4513dc2b4e2188e2772bd65659b2ab6806bd39bf0825379b1179adeea987004e' 
  AND token = 'evu4KATekPWTllOjdZ+WUI10udZVWfzRZ09kLnfBF5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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