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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4651a953594bc787c990780cbcffa1f89d86d07e889f815cc8f1bcd3ae9133fb' 
  AND token = 'CTdNGGBtBDWmSHBmYO9LK8Y44d4723qVirX7xL4jiw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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