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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c68843a9d463e39ecb70c09119e3470906c019141a40f2fb8c4a425d29c0968' 
  AND token = '1jpxSAZ+5aviXzt1njhPWtb1ewtjU0s91EjOGJe2jpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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