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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ff63b2c81b1e6f44910a3178a7695e5cd5e58e8f86265cc88e144ddf1c46ecf' 
  AND token = 'vkUmIaJiKovE/uWFHeAzyAz4obY/K3w4CNIQebxXvF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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