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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2936c6583e77dd35c665a1b2302e564ccabc825a19b285499d1bb23d2e71fd48' 
  AND token = 'jq3yWFuC23NjfFpwHxd0oTJRUmmBYQKyAit5diA/TGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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