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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd0a7a9f0c70ec07b31cc21c7c465464023323bd96ebb39cb7a94d503b689d7f' 
  AND token = 'xlgVs6b8UZHoS90QVewC9O0P/wxbMa65Nf3SbKCFsbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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