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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38b55007863a9212b83da5e108015cddd3028a1363a065dfe80d9feb1d8d16d5' 
  AND token = 'HC47gNbgfxFHAPHpZ5xvqgWSxNdoU5IcF/wGeoUVQo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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