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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caae5a28f73bcfc6ce5dba22c868ea197c66506ca665758c3e22fb2033457c05' 
  AND token = 'CfCgdy62x/ALc03kCBqLFtRqS6Z+DCpHKKtNmwfRIj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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