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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e67fcb74cfb841cb91f62b9d79a9dc9b94fe6cd14070c00e322d8d6812f124d6' 
  AND token = 'PSGjvmK8PfAk8cfx+tO3srLM+x/vyktE/sz93BopSf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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