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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f07496034a6e09df27b30fe0e92ae1cd7f480ca8492700226ff0240fb9b3c4fa' 
  AND token = '/XuB6RmdPxk2+x63Sm5ws19OkCo95zoYWNTAXtDlkB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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