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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cc35a9974bf0104915725e50961ad70ef3cece5bced3a56f20367afc767eece' 
  AND token = '/3LWo+YEBeHiT5tNNgtLvaw/m0rFb2ARzOqS9h041g8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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