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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e01c32418cb0a78ddb9d6fbb8ac3c26891cb795784df63606acc31253b5e97e' 
  AND token = 'SoIE2VTgZMax5yI9Nm+N8N6sAw9Lt8W4HJyUr4eM1EY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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