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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc9a88c75fa80b4c0c06edc16d3109c5bd2fa5de3ed7f8de22950e7f757e006a' 
  AND token = '0uK44DPjLxoeIv9LMgafF8S8TX+nhiHDDI9N7Nc9tzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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