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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84eb0ebaaf44a3ff14c2560efd2edfa31a1d0e8a7f64228502d0a79fd7c8eb42' 
  AND token = 'ax0w8w5rlKMMFMoA4cBPW34IUntTzYOSVm/DRZXcRqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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