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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb08319c898e2c836670070a716ddcde0955bd2a778a6e103031f456f2b312cb' 
  AND token = 'Sm+naUcu7utspR5QkWVxlWyVq9pK1O3EKH7QR5MEEJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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