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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a586a46d3f7df3f8c2fd4b621e623580208175623f5c0681a059a9a05a4a3af4' 
  AND token = 'n/PhGJgBnsHTKoSwlMFFd5wthliH6C0wtkenbKLEM2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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