SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c56de0f141cb07854f0f9f27b983a2ceeb23e33ed9d54e44719b116d018169f6' 
  AND token = 'ssknqwZL7r6+Z8cJKvHLgvYvP3IY1FXk65GxE8ZFXUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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