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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32a290ab092e9cb3b533217ef0e16951d7343f7023f59354287ea5a61d177a4c' 
  AND token = 'ptW3pzBLPbcmtZ7751Kj9AhtNwh5nWumbz6h+CPip/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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