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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81793bedd5b7cdf5fcf8b9aa7648c8bb82f3fc794b508a72e3a78920a518970c' 
  AND token = 'E5A7Rev8+dlYK4E9UaYbo1mb3hhhT0jWZEQsw+K2V7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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