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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac1c5079a6b31f19c17f5d099877d2d9c0bdf40598dccd4efcb4f3bebf45f49b' 
  AND token = 'DMU/X1OMRqTKWCqIHZGscS3F0Ia9DreACT9jsVaXJ70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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