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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bee7026ad8d1112f441d761f9200d3e4cc4aa28a1e6c753554554b5be055427e' 
  AND token = 'vyRKN3QsTLHsDtzoUfGQA3U/RvpuDuiLJYAEjPrG7uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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