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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a46ed56db27c77d4bc623170af9924ce1a119b545474a5f1da82da6f2a66e696' 
  AND token = 'aW4UOje6Mt20Hc+tV7r+FGkGe/PtPduWulQJBfq5Flw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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