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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da15e50c1e78b7df9ba2fe6b7d5cbf5a2b245593230b2fa0ffe70def5dc7d777' 
  AND token = 'Xi/7iZdNlaUQ2Y5nDA5+uXotBv6nvLAWQhJPAff7Qtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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