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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9d2f1abe2b0779dc15b7e0e58e76d8a5b7cbb08d101ac9ea1a186aa1a284a8d' 
  AND token = 'Urvlnp6o/reUBP1WkJSYhwfXjU91VfZM6BvPpev+jOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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