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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3743054a50b9f6d97cc3a7f1e9d10cb9f8f78f58f91d63d30fcf213ccc883a32' 
  AND token = 'jBBFKOWEXFa1npWT3Sh0rThXcijdCfk6bS/1FBqflUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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