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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c730d16f855e699bb921a1d38beb13033cfc5686af01991a59135d5f2364650c' 
  AND token = 'HNuEUfyiiUEv3/CjUNjtYClObAPr46JwkzGL+xbFnew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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