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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd980bf63e0f4a1d77b95bd9e0c8fd9abc808a95ed05bfc31d8643f71cd1b6015' 
  AND token = '9serM9PPDbDBWbw7y+qyHBirhmF0swwpIzKDv8R40zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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