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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c36332a28022bdb47b28e6cebda1469999b5337f54e1e0966ac9ab9422e75e83' 
  AND token = '5qoec/rQOOgX0KsPYRJ8XkB8BfCMuj9SURsLbe50O2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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