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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee76236a378a3aea94ff75e73c1268f1bb701c8fb8a046e0333c9af1f57e227c' 
  AND token = 'pJNpMa3uw9OZYPVatNPK1nZHu7TBS+pWDv8OnYipYO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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