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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87b9a8e672a7831362be555b4fa7f115b6f54cee3f27241841c59bf79bc8598d' 
  AND token = '8weu2NRP75P5c6pFunziO6kqPoKKSLi0OcD5g+thEG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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