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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37c66c58184c21200a14847306feb4fdcaab55b4b3482b815ef9e24a60518a4a' 
  AND token = 'Sdr88tK2IWLCUQCjwHE6aLbpruJVOcfBtDA1VSsriXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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