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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37e88f854b9d17c141a16e506a866417f2531f6f81d140b4e243116ca06804c0' 
  AND token = 'ZP2deoKjZEJGo9IWUlzredrYhKOnJTfk8XgjUznH/94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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