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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19b69b5d811d6c6c7df9ee87e0232a4eb6b5d18b33fba115d846fda39325fd1a' 
  AND token = 'hsUHy00fQe9nZM69a2PAdH/NhC1xfE+AaJQqe7wNWfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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