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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3137732624366a255dd607e96e3bd589853369585c15abc6338b90162d259238' 
  AND token = 'CmAuLfDkYErZZ6kNIWP7TOyPbEOIiEAOuV9F3E5Fw8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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