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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '444ab71e7506ad38e0982e9b7e0f9031a4efa8ec0c5faf8f6fba48fa0d64d2b9' 
  AND token = '5gwYA/dgNem8+kOLKkHr1RzsM6l2rd1xBKNO10BkOBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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