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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29ba770f6d13b31a7fa0bb355e2ef23ff25927958c128b55b2fe1a8399cf56dc' 
  AND token = '2SjfFEKPejOcKq714I2iMRGeh7TQxJUEa4bPHvyNRPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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