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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e630c38c0777b0548eae479adac834ed68229b6cc71ec5bf490a651d195a9ff' 
  AND token = 'YFwOHfNO5xzJlYjCUxJ79Iqf833z8HP36p4uD0t8Af4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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