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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f88164f75c2c221f53194e4a73301c54d672e9d8e834db933e15c94fd7672526' 
  AND token = '3zVvCDq7JHSdr/8rEbIylbKDl1GsMAf4ms3XgrLJK68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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