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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6a37ab12a6a14a4874e19facaa5a1e841c6e4ba71b5cc835b77d9534a520182' 
  AND token = 'mdZRhDKUpA/5H4MT2Y1pb0wXZx+El3o/RiBBy+e/uHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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