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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b57b69608ecd19b28313ff5e94a187d4a2cf31631a1f5a881474e85fe53aca78' 
  AND token = 'RVySIwbHDrtjUCtvX/SXCS4Yfqwy3dowmVa/5P41lVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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