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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e7dc770ba27cf7758c3a65ccab1404282d95cc1e5c2ae9250c8c22cc52cb61c' 
  AND token = 'p5sWZER7om+0ACa9lGYt0UxnE8o4wZYOlbnsO9R55wI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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