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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e2064daa3f0e84a2fc2e5a65fa9d455895a57428f237da67d4241a177c75dbb' 
  AND token = 'u36Sd0ckayPlLu1P0xTcvHhZ1lWA49xsHa+7btS8A1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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