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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '647cfc953e2e59e6be18cb05b47bf77c5b83970fd4a8559ad6a09d000c938ca6' 
  AND token = 'giHN0Q1Lfp2eukVEJ3YNJmOLUsZLEi8+tfnUu2nwGIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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