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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4324e567ea6fac4a851e0f6b8ec4828e94a0796c210069659bac8ee23ae0967b' 
  AND token = 'eyfwu7LwXwWTDJhOkQoDPZ6YTMHEBSdfD8rKm8snkcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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