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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9051793f34ab2e366ede060d80ab326f96d524caf254b0a4987507df266d4f99' 
  AND token = '35c9GRuCR2jg9gLTjYxlyTf11tQXEF/GswY5AEZXfbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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